Humeral implant for shoulder prosthesis

• US 20060200249A1
• Filed: 03/03/2005
• Published: 09/07/2006
• Est. Priority Date: 03/03/2005
• Status: Active Grant

• Current Assignee: Biomet France, Bruno Rio, Bruno Toussaint, Bruno Zipoli, Charles Cohn, Denis Bouttens, Dominique Huguet, Eric Lesprit, Geert Declercq, Jacques Teissier, Jean Grimberg, Laurent Beguin, Pierre Massart
• Original Assignee: Biomet France, Bruno Rio, Bruno Toussaint, Bruno Zipoli, Charles Cohn, Denis Bouttens, Dominique Huguet, Eric Lesprit, Geert Declercq, Jacques Teissier, Jean Grimberg, Laurent Beguin, Pierre Massart
• Inventors: Zipoli, Bruno, Declercq, Geert, Bouttens, Denis, Grimberg, Jean, Rio, Bruno, Cohn, Charles, Teissier, Jacques, Lesprit, Eric, Massart, Pierre, Toussaint, Bruno, Beguin, Laurent, Huguet, Dominique, Brunnarius, Yann
• Granted Patent: US 7,445,638 B2
• Time in Patent Office: Days
• US Class Current: 623/19.140
• CPC Class Codes: A61F 2/4014 Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30537 adjustable
• CPC Class Codes: A61F 2002/3054 about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30607 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2002/3082 Grooves
• CPC Class Codes: A61F 2002/4037 Connections of heads to necks
• CPC Class Codes: A61F 2002/4044 Connections of necks to shafts
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2250/0004 adjustable
• CPC Class Codes: A61F 2250/0062 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium

Abstract

This adaptable humeral implant comprises an anchoring stem (1, 8) and a male insert (6) or a female insert (30, 31) which are able to cooperate with the glenoid cavity or a glenoid implant. It additionally comprises a removable support (5) intended to fit directly or indirectly to the upper end (3) of the anchoring stem (1, 8) and to cooperate with an intermediate neck (7), which is itself provided with means for cooperation with the male or female implant.

Claims

1. Adaptable humeral implant comprising:

an anchoring stem (1, 8);

a male insert (6) or a female insert (30, 31) which are able to cooperate with the glenoid cavity or a glenoid implant,

a removable support (5) intended to fit directly or indirectly to the upper end (3) of the anchoring stem (1, 8) and to cooperate with an intermediate neck (7, 32), which is itself provided with means for cooperation with the male or female implant;

characterized in that the removable support (5) is in the shape of a basket provided with a circular seat (13) with a through-opening (17), and comprising at least three identical branches (14) substantially in the shape of an arc of a circle which are spaced apart at intervals and give said support a general hemispherical shape.

2. Adaptable humeral implant according to claim 1, characterized in that the outer face of the branches (14) is provided with teeth (15) which are intended to cooperate with spongy bone.

3. Adaptable humeral implant according to claim 1, characterized in that the cylindrical seat (13) of the support (5) has, on its lower face, radial sets of teeth (16) which are spaced apart at intervals and are intended to permit correct positioning of the basket (5) on the upper end (3, 18) of the anchoring stem (1, 8).

4. Adaptable humeral implant according to claim 1, characterized in that the anchoring stem (1, 8) has, in the area of its upper end (3), a recess (27, 28) of truncated cone shape, intended to cooperate with the lower end (24), also of truncated cone shape, of the neck (7).

5. Adaptable humeral implant according to claim 1, characterized in that the anchoring stem (1, 8) has, in the area of its upper end (3), a recess (27, 28) of cylindrical shape, provided with an internal thread, intended to cooperate with the lower end (24) of the neck (7) provided with a corresponding threading (25).

6. Adaptable humeral implant according to claim 1, characterized in that the intermediate neck (7) has three co-linear segments:

the upper end (20) in the form of a morse cone which is able to cooperate with the male insert (6);

a portion (22) of greater diameter on which said male insert (6) rests;

a cylindrical zone (23) intended to cooperate with the aperture (17) of the seat (13) of the basket (5), and continuing via a lower end (24) which has either a morse cone shape or a threading (25), these two zones being separated by a zone (26) of smaller cross section.

7. Adaptable humeral implant according to claim 6, characterized in that the male insert or humeral prosthetic head (6) is formed by a hemisphere whose base (10) is provided with a conical recess (11), either centred or eccentric, able to cooperate with the upper end (20) of the neck (7).

8. Adaptable humeral implant according to claim 6, characterized in that the female insert (30, 31) is formed by a cup (30) whose outer envelope corresponds substantially to the internal volume defined by the basket (5), and which is continued via a central shaft (32) positioned at its pole, and fulfills the same function as the neck (7), and is intended to cooperate with the recess (17) of the stem (1), said cup (30) being intended to receive a polyethylene insert (31) which clips into the cup (30).